The number of ET's by an average volunteer during one year of service. Since most volunteers successfully complete their service, which is longer than one year, this number would be a "fraction of an ET". If the V-Year ET Rate was 0.20 (per year) we would expect about 2 volunteers out of 10 to ET per year, or about 1 volunteer out of 10 in a six-month period. (<a href="http://peacecorpswiki.org/Early_Termination">Ref.</a>)

Average length of service(months)

Average length of service among all volunteers (in months)

Note: [TOTAL served any part of year] = [Finished Service (COS)] + [Early Terminated (ET)] + [Currently Serving]
The volunteers who [Entered Service] are already counted in one of three categories as during that year they have either COSed, ETed, or are still currently serving.

The above probabilistic model of Peace Corps was developed by Michael Sheppard (RPCV / The Gambia), and it should be taken as an estimate only

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